Misplaced Pages

Echinoconchinae Temporal range: Visean–Upper Permian PreꞒ Ꞓ O S D C P T J K Pg N
Fossils of Echinoconchus (13-26) along with other brachiopods
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Brachiopoda
Class:	†Strophomenata
Order:	†Productida
Family:	†Echinoconchidae
Subfamily:	†Echinoconchinae Stehli, 1954
Subgroups
†Calliprotoniini †Calliprotonia †Echinoconchini †Chengxianoproductus †Echinaria †Echinoconchus †Stepanoconchus †Karavankinini †Echinoconchella †Karavankina

Echinoconchinae is an extinct subfamily of brachiopods which lived during the Carboniferous and Permian periods in marine habitats. The family had a cosmopolitan distribution.

Taxonomy

The exact evolutionary relationships of Echinoconchinae relative to other groups of the suborder Productidina have been a matter of extensive debate throughout much of the 20th Century, primarily due to the three genera Buxtonia, Pustula and Juresania (with the debate later expanded to their families and subfamilies) shifting in position repeatedly between phylogenies and classifications. The emphasis on internal versus external characters to determine the systematics of these groups has largely been responsible for this: the original Treatise on Invertebrate Paleontology published in 1965 placed emphasis on internal characters (including the cardinal process) as diagnostic, whereas the 2000 revision primarily used external features and shell shape, resulting in differing classification of these clades.

More recently, Leighton & Maples (2002) conducted multiple phylogenetic analyses which are strongly in agreement that the four subfamilies Echinoconchinae, Buxtoniinae, Pustulinae and Juresaniinae form the family Echinoconchidae. The cladogram results of their phylogenetic analyses are displayed in the cladogram below:

References

1. Stehli, Francis Greenough (1954). "Lower Leonardian Brachiopoda of the Sierra Diablo". Bulletin of the AMNH. 105 (3): 261–358.
2. Williams, Alwyn (2000). Part H Brachiopoda (revised): Volumes 2 & 3, Linguliformea, Craniiformea, Rhynchonelliformea (part)., Treatise on Invertebrate Paleontology. Geological Society of America. p. 509.
3. Leighton, Lindsey R.; Maples, Christopher G. (July 2002). "Evaluating internal versus external characters: Phylogenetic analyses of the Echinoconchidae, Buxtoniinae, and Juresaniinae (Phylum Brachiopoda)". Journal of Paleontology. 76 (4): 659. doi:10.1666/0022-3360(2002)076<0659:EIVECP>2.0.CO;2. ISSN 0022-3360.

• Rhynchonellata